Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
The circuit shown was found in an American documentation from 1964. The circuit uses transistors of...
We found this antenna amplifier or Booster circuit in an Electronics Now from the 90s. The circuit...
This dimmer with a unijunction transistor and SCR appeared in Radio Electronics magazine in March...